The following are some statements regarding Claude's method
I : The boiling point of `Ar` is nearer to `O_2`
II : `N_2` is removed as `CaCN_2`
III : `O_2` is removed as `MgO`
IV : From a mixture of He and Ne, Ne is removed by liquifaction with liquid hydrogen
The correct statements are 

Options

A. Both I and II
B. Both I and III
C. Both I and IV
D. I, II and IV

Answer

To determine the correct statements regarding Claude's method, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I: The boiling point of Ar is nearer to O2.**
- **Analysis:** The boiling point of Argon (Ar) is approximately -185.8 °C, while the boiling point of Oxygen (O2) is about -183 °C. Since these values are quite close, this statement is **correct**.

2. **Statement II: N2 is removed as CaCN2.**
- **Analysis:** Nitrogen gas (N2) can react with calcium carbide (CaC2) to form calcium cyanamide (CaCN2). This process is indeed a method to remove nitrogen from a mixture. Therefore, this statement is also **correct**.

3. **Statement III: O2 is removed as MgO.**
- **Analysis:** Oxygen (O2) does not get removed as magnesium oxide (MgO). Instead, oxygen can be removed by other methods, but not in the form of MgO. Hence, this statement is **incorrect**.

4. **Statement IV: From a mixture of He and Ne, Ne is removed by liquefaction with liquid hydrogen.**
- **Analysis:** In the separation of helium (He) and neon (Ne), neon can indeed be removed by liquefaction using liquid hydrogen, as neon has a higher boiling point than helium. Thus, this statement is **correct**.

### Conclusion:
The correct statements regarding Claude's method are:
- Statement I: Correct
- Statement II: Correct
- Statement III: Incorrect
- Statement IV: Correct

Thus, the correct statements are I, II, and IV.

### Final Answer:
The correct statements are I, II, and IV.

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